9401591 has 4 divisors (see below), whose sum is σ = 9561000. Its totient is φ = 9242184.

The previous prime is 9401569. The next prime is 9401627. The reversal of 9401591 is 1951049.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9401591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9400591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79616 + ... + 79733.

It is an arithmetic number, because the mean of its divisors is an integer number (2390250).

Almost surely, 2^9401591 is an apocalyptic number.

9401591 is a deficient number, since it is larger than the sum of its proper divisors (159409).

9401591 is a wasteful number, since it uses less digits than its factorization.

9401591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159408.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 9401591 is about 3066.2013958643. The cubic root of 9401591 is about 211.0573356312.

The spelling of 9401591 in words is "nine million, four hundred one thousand, five hundred ninety-one".